With the current COVID-19 situation many airfields, certainly in the UK, are deactivating their CTAs and/ or CTRs overnight. For some aerodromes such as Birmingham and Southend this is shown on the mobile app by green boundaries:

From eyeballing the NOTAM, it appears it has been lazily published such that its radius covers the entire FIR. SkyDemon does not display such NOTAM on the map, which means you don't get the coloured outlines.

It's worth remembering that while we are often able to do very clever things with NOTAM, when they are published to a certain standard, it's also the case that NOTAMs are an imperfect system and what we can display on the map varies, whereas the NOTAM briefing itself is always authoritative.